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Guitar Preamp Effects loop problem


Jan 25, 2021
Jan 25, 2021

I have a ADA guitar preamp that has a effects loop problem?

The Stereo Sends are working A, B, The Returns are not.
I don't know if it could be something as small as a resistor, diode, transistor,
or something more complex in the diagram electronic digital switch?

I think the problem lies within Channel B because it clips and goes away. (only dry signal)

Most places wont’ touch rack mount guitar gear?

I’ll post links to the PDF in case.

You can hear the return on B channel over modulated then it goes away.
the A is silent.

It's in very good condition but with this issue.

Unfortunately I’m a novice with a schematic but have good solder skill and have both a

DMM and a Cap meter. I made minor repairs but this is something out of my league.

Any advice